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- This is a port of btoa version 5.2, written by Paul Rutter, Joe
- Orost & Stefan Parmark. btoa converts 4 binary characters to 5
- ascii ones, causing a 25% expansion. (btoa is thus more efficient
- than uuencode, which causes a 33% expansion.) Spaces will not be
- used, which should make it safe to send files over e-mail or Usenet
- without risking that blanks become tabs. Each resulting row of
- text has a single-byte checksum for error detection. A diagnosis
- file provides a list of errors found this way, which could then be
- used to retransmit only the failing lines.
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